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// Helper functions for snapchanged-on-programmatic-* tests.
// Utility function to test that onsnapchanging is triggered for
// snapchanging-on-programmatic-* tests which set up a similar layout in which
// the |scroller| has 3 snap targets that form a vertical column along
// |scroller|'s middle. onsnapchanging should be triggered by conducting a
// programmatic scroll to the top of snap_target.
async function test_programmatic_scroll_onsnapchanging(test,
scroller,
event_target,
snap_target) {
await snap_test_setup(test, scroller, "snapchanging");
const expected_snap_targets = { block: snap_target, inline: null };
// Scroll and wait for a snapchanging event.
const snapchanging_promise = waitForOnSnapchanging(event_target);
scroller.scrollTo(0, snap_target.offsetTop);
const snapchanging_event = await snapchanging_promise;
// Assert that snapchanging fired and indicated that snap_target would
// be snapped to.
assertSnapEvent(snapchanging_event, expected_snap_targets);
assert_equals(scroller.scrollLeft, 0, "scrollLeft is zero");
assert_equals(scroller.scrollTop, snap_target.offsetTop,
"snapped to snap_target");
}
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